# FDMNES

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The '''FDMNES''' program calculates the spectra of different [spectroscopies](/source/Spectroscopy) related to the real or virtual absorption of [x-ray](/source/x-ray) in material. It gives the absorption cross sections of [photons](/source/Photon) around the ionization edge, that is in the energy range of [XANES](/source/XANES). The calculation is performed with all conditions of rectilinear or [circular polarization](/source/circular_polarization). In the same way, it calculates the structure factors and intensities of anomalous or resonant diffraction spectra (DAFS or RXS).

The code uses two techniques of monoelectronic calculations. The first one is based on the Finite Difference Method ([FDM](/source/Finite_difference_method)) to solve the [Schrödinger equation](/source/Schr%C3%B6dinger_equation). In that way the shape of the potential is free and in particular avoid the [muffin-tin approximation](/source/muffin-tin_approximation). The second one uses the Green formalism ([multiple scattering](/source/Multiple_scattering_theory)) on a muffin- tin potential. This approach can be less precise but is faster.

FDMNES is used as external program to calculate basic spectra for XANES fitting using [FitIt](/source/FitIt).

It can also be used to calculate [X-ray Raman scattering](/source/X-ray_Raman_scattering) spectra.<ref>{{Cite journal|last1=Joly|first1=Yves|last2=Cavallari|first2=Chiara|last3=Guda|first3=Sergey A.|last4=Sahle|first4=Christoph J.|date=2017-05-09|title=Full-Potential Simulation of X-ray Raman Scattering Spectroscopy|journal=Journal of Chemical Theory and Computation|volume=13|issue=5|pages=2172–2177|doi=10.1021/acs.jctc.7b00203|pmid=28430428 |issn=1549-9618}}</ref>

==References==
* {{cite journal | last=Joly | first=Y. | title=X-ray absorption near-edge structure calculations beyond the muffin-tin approximation | journal=Physical Review B | publisher=American Physical Society (APS) | volume=63 | issue=12 | date=2001-03-13 | issn=0163-1829 | doi=10.1103/physrevb.63.125120 | article-number=125120| bibcode=2001PhRvB..63l5120J }}
<references />

==External links==
* [http://fdmnes.neel.cnrs.fr/ FDMNES home page]

Category:Physics software
Category:Computational chemistry software

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